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171 lines
4.0 KiB
171 lines
4.0 KiB
/*
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* Copyright (C) 2010,2011,2013 by Jonathan Naylor G4KLX
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* Copyright (c) 2017-2018 by Thomas A. Early N7TAE
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string>
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#include "G2ProtocolHandler.h"
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#include "Utils.h"
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// #define DUMP_TX
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const unsigned int BUFFER_LENGTH = 255U;
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CG2ProtocolHandler::CG2ProtocolHandler(unsigned int port, const std::string& addr) :
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m_socket(addr, port),
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m_type(GT_NONE),
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m_buffer(NULL),
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m_length(0U),
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m_address(),
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m_port(0U)
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{
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m_buffer = new unsigned char[BUFFER_LENGTH];
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}
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CG2ProtocolHandler::~CG2ProtocolHandler()
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{
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delete[] m_buffer;
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portmap.clear();
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}
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bool CG2ProtocolHandler::open()
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{
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return m_socket.open();
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}
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bool CG2ProtocolHandler::writeHeader(const CHeaderData& header)
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{
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unsigned char buffer[60U];
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unsigned int length = header.getG2Data(buffer, 60U, true);
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#if defined(DUMP_TX)
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CUtils::dump("Sending Header", buffer, length);
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#endif
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in_addr addr = header.getYourAddress();
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auto found = portmap.find(addr.s_addr);
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unsigned int port = (portmap.end()==found) ? header.getYourPort() : found->second;
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for (unsigned int i = 0U; i < 5U; i++) {
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bool res = m_socket.write(buffer, length, addr, port);
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if (!res)
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return false;
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}
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return true;
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}
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bool CG2ProtocolHandler::writeAMBE(const CAMBEData& data)
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{
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unsigned char buffer[40U];
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unsigned int length = data.getG2Data(buffer, 40U);
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#if defined(DUMP_TX)
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CUtils::dump("Sending Data", buffer, length);
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#endif
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in_addr addr = data.getYourAddress();
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auto found = portmap.find(addr.s_addr);
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unsigned int port = (portmap.end()==found) ? data.getYourPort() : found->second;
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return m_socket.write(buffer, length, addr, port);
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}
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G2_TYPE CG2ProtocolHandler::read()
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{
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bool res = true;
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// Loop until we have no more data from the socket or we have data for the higher layers
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while (res)
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res = readPackets();
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return m_type;
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}
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bool CG2ProtocolHandler::readPackets()
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{
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m_type = GT_NONE;
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// No more data?
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int length = m_socket.read(m_buffer, BUFFER_LENGTH, m_address, m_port);
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if (length <= 0)
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return false;
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m_length = length;
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// save the incoming port (this is to enable mobile hotspots)
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if (portmap.end() == portmap.find(m_address.s_addr)) {
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printf("new address %s on port %u\n", inet_ntoa(m_address), m_port);
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portmap[m_address.s_addr] = m_port;
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} else {
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if (portmap[m_address.s_addr] != m_port) {
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printf("new port for %s is %u, was %u\n", inet_ntoa(m_address), m_port, portmap[m_address.s_addr]);
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portmap[m_address.s_addr] = m_port;
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}
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}
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if (m_buffer[0] != 'D' || m_buffer[1] != 'S' || m_buffer[2] != 'V' || m_buffer[3] != 'T') {
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return true;
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} else {
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// Header or data packet type?
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if ((m_buffer[14] & 0x80) == 0x80)
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m_type = GT_HEADER;
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else
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m_type = GT_AMBE;
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return false;
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}
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}
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CHeaderData* CG2ProtocolHandler::readHeader()
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{
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if (m_type != GT_HEADER)
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return NULL;
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CHeaderData* header = new CHeaderData;
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// G2 checksums are unreliable
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bool res = header->setG2Data(m_buffer, m_length, false, m_address, m_port);
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if (!res) {
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delete header;
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return NULL;
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}
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return header;
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}
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CAMBEData* CG2ProtocolHandler::readAMBE()
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{
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if (m_type != GT_AMBE)
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return NULL;
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CAMBEData* data = new CAMBEData;
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bool res = data->setG2Data(m_buffer, m_length, m_address, m_port);
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if (!res) {
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delete data;
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return NULL;
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}
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return data;
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}
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void CG2ProtocolHandler::close()
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{
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m_socket.close();
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}
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